STRUCT ACRN_PCI_REQUEST(9)

💅 struct acrn_pci_request(9) — a Kernel API Manual moment ✨

okay so bestie, welcome to the struct acrn_pci_request page, straight out of the Kernel API Manual. this is the lowkey iconic little struct that holds Info of a PCI I/O request — that's literally the NAME, we're not making it up, it's giving "cover of the group chat" energy 🎀

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✨ SYNOPSIS ✨

okay so here's the whole vibe, copied exactly because we do not touch the source code, ever, periodt:

struct acrn_pci_request {
    __u32 direction;
    __u32 reserved[3];
    __u64 size;
    __u32 value;
    __u32 bus;
    __u32 dev;
    __u32 func;
    __u32 reg;
 };

look at her. so neat. so structured. main character struct energy fr fr 👑

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🫶 Members 🫶

okay so every single field, no skipping, we eat the whole thing:

• direction — the access direction of this request (that's the ACRN_IOREQ_DIR_* crew, iykyk) 💅
• reserved — reserved for alignment, and it should be 0, no cap, that's the whole job
• size — the access size of this PCI I/O request
• value — the read/write value of this PIO I/O request ✨
• bus — the PCI bus value of this PCI I/O request
• dev — the PCI device value of this PCI I/O request
• func — the PCI function value of this PCI I/O request
• reg — the PCI config space offset of this PCI I/O request

that's eight fields bestie, count 'em, all accounted for 💖

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🦋 Description 🦋

okay so the entire plot twist here is tiny but crucial: you need keep same header layout with struct acrn_pio_request. that's it. that's the whole description. alignment baddie behaviour 🧚

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💜 SEE ALSO 💜

like, go read these too, they're all part of the same friend group:

• the Kernel file ./include/uapi/linux/acrn.h
• struct acrn_mmio_request(9)
• struct acrn_pio_request(9)
• struct acrn_io_request(9)
• struct acrn_ioreq_notify(9)
• struct acrn_vm_creation(9)
• struct acrn_gp_regs(9)
• struct acrn_descriptor_ptr(9)
• struct acrn_regs(9)
• struct acrn_vcpu_regs(9)
• struct acrn_vm_memmap(9)
• struct acrn_ptdev_irq(9)
• struct acrn_pcidev(9)
• struct acrn_mmio_dev_res(9)
• struct acrn_mmiodev(9)
• struct acrn_vdev(9)
• struct acrn_msi_entry(9)
• struct acrn_cstate_data(9)
• struct acrn_pstate_data(9)
• struct acrn_ioeventfd(9)
• struct acrn_irqfd(9)

the way that's a whole friend group of structs 😭 go say hi, they don't bite 🍓

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🌸 quick vibe check bestie: the layout detail is not decorative — that's the actual documented requirement, so don't go rearranging fields and acting surprised. 💀

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and that's the page!! sign-off time 🫶 this one's sourced from ./include/uapi/linux, dated October 2026, and yes the footer's still repping struct acrn_pci_request(9) because consistency slays. mwah, go read your man pages 💋🌈